Reduce your response times

I have a production server with lightspeed Enterprise 2.2.2, php 5.3.19 installed. Everything work fine only that recently we've done a speed test on one of our sites using https://developers.google.com/speed/, we got a high and medium priority "Improve server response time" exhausted all means on how to work this out with the server.

It should work with trial license. make sure your cache storage is defined in admin console and writable by web server user.

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The attached image are the settings I've done the LSWS cache seems to work because I could see binary files being stored on the cache directory however when I try curl -I corestory1.globalbizcloud.com I don't see X-Litespeed-Cache:hit, What did I miss?